How is axial-entry type turbine blading secured to the rotor wheel?

How is axial-entry type turbine blading secured to the rotor wheel?

• A. By a platform interlock, pin or key
• B. By welded joints
• C. By magnetic locking mechanisms
• D. By friction mounting

Answer: (A)

Axial-entry type turbine blading is secured to the rotor wheel primarily by a platform interlock, pin, or key. This method ensures that the blades are firmly anchored to the rotor while allowing for the necessary thermal expansion that occurs during operation. The platform interlock is a mechanical feature that helps maintain proper alignment and prevents the blades from moving out of position. Pins or keys provide additional security by interlocking the blade with the rotor, ensuring that the blades do not disengage under the forces experienced during operation. This reliable attachment method is critical for maintaining efficiency and performance in turbomachinery, as well as for safety. The other options describe different methods of securing components in various applications, but they are not suitable for axial-entry turbine blading. Welding, for instance, would create a permanent bond that could complicate maintenance or blade replacement. Magnetic locking mechanisms and friction mounting do not provide the structural integrity needed for high-stress applications found in turbine operation. Therefore, the use of a platform interlock, pin, or key is the most effective and widely used approach in securing axial-entry turbine blading to the rotor wheel.

Axial-entry type turbine blading is secured to the rotor wheel primarily by a platform interlock, pin, or key. This method ensures that the blades are firmly anchored to the rotor while allowing for the necessary thermal expansion that occurs during operation.

The platform interlock is a mechanical feature that helps maintain proper alignment and prevents the blades from moving out of position. Pins or keys provide additional security by interlocking the blade with the rotor, ensuring that the blades do not disengage under the forces experienced during operation. This reliable attachment method is critical for maintaining efficiency and performance in turbomachinery, as well as for safety.

The other options describe different methods of securing components in various applications, but they are not suitable for axial-entry turbine blading. Welding, for instance, would create a permanent bond that could complicate maintenance or blade replacement. Magnetic locking mechanisms and friction mounting do not provide the structural integrity needed for high-stress applications found in turbine operation. Therefore, the use of a platform interlock, pin, or key is the most effective and widely used approach in securing axial-entry turbine blading to the rotor wheel.